祁连山高山灌丛生物量分配规律及其与环境因子的关系

以祁连山3300~3700m高山灌丛为研究对象,采用标准地、样方收获法以及壕沟挖掘方法,对不同海拔高度灌丛生物量,器官生物量进行调查,并分析灌丛生物量分配规律及其与环境因子的关系。结果表明：（1）祁连山高山灌丛生物量与海拔高度呈现显著的负相关性（y=-37.074x＋142 627,P=0.01,R2=0.589）,随着海拔的升高,灌丛总生物量,地上生物量以及地下生物量均呈现下降的趋势。灌丛根茎比随着海拔的上升先增加后减小,呈倒U型。（2）土壤含水量对地下部分生物量的影响相对于地上部分而言更加明显（R2=0.478）,地下各器官相关性系数依次为粗根生物量（R2=0.981）〉细根生物量（R2=0.661）〉须根生物量（R2=0.375）;土壤容重随着海拔的上升而增加,灌丛总生物量则减少,呈现出灌丛生物量随着海拔的上升而减少的趋势;土壤含水量、土壤容重与土壤温度共同对灌丛生物量起着重要的作用。

Assignment rule of alpine shrubs biomass and its relationships to environmental factors in Qilian Mountains

The alpine shrubs on the altitude of 3 300-3 700 m in the Qilian Mountains were taken as a test object to analyze the total biomass and organic biomass of alpine shrubs and to investigate the assignment rule of alpine shrubs biomass and its relationships to environmental factors.For this purpose plot,traditional harvesting method and mining trenches method had been used.The results are as follows:(1) the altitude and biomass had showed a significant negative correlation(y=-37.074x+142 627,P=0.01,R2=0.589);w...